I'm assuming the car started normally before this two-week layoff.

If jumpstarting didn't work, it's probably not the battery. ..probably..

So ... first measure the voltage. If the charger indicates it's full, it should be 13V+. If you can, have a voltmeter on so you can read it while attempting to crank (the dreaded clicking noises). If it drops below 11V, it may well be dead. If it stays up, you may have either a dead/dying solenoid in the starter or (hopefully) a poor connection from the battery to the solenoid. Follow the heavy wire (cable) from the battery + terminal to the next junction. Loosen & wiggle that junction, maybe even take it apart & wire brush it. Retighten it without going overboard. While you're at it, wire brush both battery terminals & the cable clamp. You get the idea, follow the trail to the starter and make sure all electrtical connections are good. Ground connections are also important to complete the circuit back to the battery, but IMHO are less likely to be a problem. It won't hurt to check. After all that, it might be the battery.

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Norm in NJ
Next oil change at 230,000miles